Domain classes not visible to Data layer (Application context class )

Question

To make data-layer be aware of my domain classes, I've added a reference between the two class libraries, HMSContext (i.e., data-layer) and Hms.Entities (i.e., domain-classes).

Following is code from HMS.Entities:

namespace HMS.Entities
{
    class Accomodation
    {
        public int ID { get; set; }
        public int AccomodationPackageID { get; set; }
        public AccomodationPackage AccomodationPackage { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
    }
}

Code from HMSContext.cs:

using System.Data.Entity;

namespace HMS.Data
{
    public class HMSContext : DbContext
    {
        public DbSet<Accomodation> Accomodations { get; set; }

    }
}

I've added a reference between these two .dlls. A snapshot showing this is attached here. For some reason, HRMContext.cs is not reading HMS.Entities despite added reference. Am I missing anything? Can someone please shed light on this. Thanks in advance.

for starters, you are missing `using HMS.Entities` – Felix May 03 '22 at 17:53 — Felix, May 03 '22 at 17:53

Reza Heidari · Accepted Answer · 2022-05-05T23:52:03.297

0

You are using using System.Data.Entity; where it is not related to your project structure. So add HMS.Entities too.

Any time you have such a problem, try using the full namespace and check if it is correct or not.

Note that you also have refactoring capabilities too. You can use ( Ctrl + . ) and Visual Studio helps you to use the correct namespace.

Your code has to be like this:

using System.Data.Entity;
using HMS.Entities;

namespace HMS.Data
{
    public class HMSContext : DbContext
    {
        public DbSet<Accomodation> Accomodations { get; set; }
    }
}

And for the Entity class you should use public keyword:

namespace HMS.Entities
{
    public class Accomodation
    {
        public int ID { get; set; }
        public int AccomodationPackageID { get; set; }
        public AccomodationPackage AccomodationPackage { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
    }
}

edited May 05 '22 at 23:52

answered May 03 '22 at 17:53

Reza Heidari

1,192
2
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while typing using HMS.Entities [this](https://pasteboard.co/mgd8UYX6Pku2.png) error is showing up – Oxin May 03 '22 at 18:01
@Oxin you forgot `public` keyword. – Reza Heidari May 03 '22 at 18:04
btw, without `using System.Data.Entity`, how will `HMSContext` inherit from `DbContext`? – Oxin May 03 '22 at 18:04
True that. I added `public` keyword to `Accomodation` class and problem has resolved. Thank You Sir. – Oxin May 03 '22 at 18:06
@Oxin just keep `using System.Data.Entity` and add your entity's namespace. – Reza Heidari May 03 '22 at 18:06

Domain classes not visible to Data layer (Application context class )

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